UPDATE 1-S.Korea KOGAS says March LNG sales up 8.7 pct y/y

3.6 mln T in March vs 3.3 mln T yr ago * S.Korea's Feb LNG imports down 10 pct y/y (Adds details) SEOUL, April 12 Of the total, 2 million tonnes were for household and business consumption, up 4 percent year on year, KOGAS, the...